Pump jack



mvmss Jupe 16, 1925. r

1,542,679 T. DUNN 4 PUMP JACK Filed May 17. 1924 2 Sheets-Sheet l III INTO Patented June '16, 1925.

PATENT OFFICE.

THOMAS DUNN, or sr. CHARLES, MISSOURI.

PUMP JACK.

Application filed May '17, 1924. Serial No. 714,118.

To all who in itma i concern:

7 Be it known that I, THOMAS DUNN, a citizen of the United States, residing at St.

Charles, in the county ofSt. Charles and State of Missouri, have invented new and useful Improvements 111 Pump Jacks,

. ofwhich the following is a specification.

This invention relates to apumping apparatus, particularlyto a pump ack device for association with a pump of the ordinary hand operated type, and has for its object the provision of a novel mechanism or transmission designed to be power operated and so constructed and arranged as to be clamped upon an ordinary hand pump and operatively connected with the operating rod thereof whereby to pump the water or other liquid in a rapid and efficient: manner.

A very important object is the provision of a ,device'of this character which is so constructed and arranged as to relieve the stroke but which also acts to assist the motor on the upstroke so that the strain on the working parts will be greatly reduced.

An additional object is the provision of a device of this character which will be.

simple and inexpensive in'manufacture, easy to install, positive in action, efiicient and durable in service, and a general improve ment in the art.

With the above and other objects and advantages in View, the invention consists in the details of construction to be hereinafter more fully described, claimed, and illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation of a pump equipped with my jack mechanism.

Figure 2 is an elevation at right angles to Figure 1.

Figure 3 is a vertical longitudinal section through the attachment.

Figure 4 is a cross section on the line 4- 1 of Figure 2.

Figure 5 is a similar View on the line 55 of Figure 2, and I Figure 6 is a detail section on the line 6-6 of Figure 2.

Referring more particularly to the drawings, the letter A designates a pump of any ordinary or well known type equipped with the usual discharge nozzle or spout B and including the vertically movable lift rod C which, in the present instance, is shown as being adapted to be reciprocated by means of a hand lever D of ordinary type pivotally mounted as shown at E on a bracket Pcarried by the "housing or casing of the pump. In carrying out my invention I provide a supporting frame which includes a pair of spaced parallel uprights 10 which may be formed as rods or tubes as preferred, which uprights areconnected by upper and lower cross members 11, and 12 respectively held in place as for instance by means of the set screws-13 as shown. To effect mounting upon the pump, I provide a pair of plate members 14 arranged above the cross members 11 and 12 and recessed at 15 and 16 for conforming engagement against the uprights and pump casing A respectively.

' Located outwardlyof the uprights 10 and engaging thereagainst are clamping plates 17 coactlng with the plates 14: and terminating in laterally extending ears 18 through which extend the threaded ends of substantially U-bolts 19 which embracingly engage the pump casing A and which are equipped with clamping nuts 20.

Mounted on the uprights 10 at a point between the cross members'll and 12, is a cross member 21 which may likewise be held by a set screw 22 at each side thereof. The.

cross piece 21 carries a stub shaft 23 on which is rotatably mounted a gear 2 1 here represented as of the spoke type and having one spoke formed with a plurality of holes 25 for a purpose to be described. The lowermost cross member 12 is formed somewhat as a platform and is provided with a hearing 26 through which is journaled a shaft 27 carrying a drive pulley 28 and also carrying a pinion 29 meshing with the gear 24. Quite naturally the shaft 27 may be driven in any desired manner as for instance by means of an electric motor, gas engine or other power device belted to the pulley 28.

Slidable upon the upper ends of the upright guides 10 is a cross head 30 which carries an arm 31 having a suitable hole through which the pump 'rod 0 extends. The pump rod is secured to this arm by means of a set screw 32 or the like and it will thus be apparent that the connection of. the arm withithe pump rod will be made atany desired point throughout the lengthof the latter. The cross head further carries a forward extension 33 upon which is pivoted, at 34, an elongated link 35 which has its other ends connected with a wrist pin 36 which may be engaged within any desired one of the holes in the .gear 24. By this adjustment it will be seen that the throw of the linksmay be varied depending upon the desired length of stroke of the .pump rod. Located-between the guides .10 is a rod'36 constituting a part of the supporting frame. Surrounding the rod 36 is a coil spring 37 which abut-s against the underside of the cross head andagainst the top of a stop collar-38 mounted on the pump rod and held thereto by a set screw 39 or the equivalent.

In the operation, it will be seen that when power is applied to the pulley 28 forrotatingthe shaft 27 the gear'QL will'berotated and as itturns the link will be reciprocated and'willoperate to slide the cross head 3011p: and down'along the upright guides 10. Owing to'the fact thatthis cross head is secured to Ithe pump rod it is quite apparent thatthe pump will be operated in exactly the same manner as if the hand lever D were used. On the downstroke of thepump rod it isquite apparent that the spring 37 will be 5 compressed. so :that its subsequent expansion willoperate to assist on the upstroke. In actual practice, I have discovered that a pump jack constructed in this manner is highly efiicient :not only for the reason that the spring acts to absorb the shock of the stroke but forthe additional reason that this will not depart from the spirit of the inven- I tion or the scope of the subjoined claim.

Having described the invention, I claim: In a device :of the character described, an uprightsupporting frame, means for mounting said frame upon a pump casing including plates disposed between the pump casing and the frame and recessed for conforming engagement therewith, clampingplates disposed outwardly of the frame, and 'coacting with said first named plates, substantially U-shaped bolts embracingly engaging the pump casing and connected with said clamping plates, and a drive mechanism for the pump rod including a cross head slidable along the frame and connected with the pump rod, a rotary element jonrnaled on the frame, a transmission mechanism for driving the rotary element, a link connection between said rotary element and cross head, and an expansion spring engaging against thecrosshead and against a stationary part of the pump.

'In'testimony whereof Iaflix my signature.

THOMAS DUNN. 

